Solution Strengthened Ductile Iron SSDI

Dura-Bar SSDI is a grade of ductile iron that combines the elevated mechanical strengths of a pearlitic ductile iron with the machinability advantages of a ferritic ductile iron. By combining the best of both desired properties, Dura-Bar SSDI is an attractive grade of ductile iron that provides several benefits towards designing and manufacturing of metal components. Download the SSDI Product Brief or the SSDI Sales Flyer to learn more.

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Dura-Bar Solution Strengthened Ductile Iron SSDI

Typical Applications

Fluid Power:

Compressors Rotors, Hydraulic Manifolds & Cylinders.

Oil & Gas:

Plug Value Inserts and Crossheads

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Heat Treat Response

Initial test results prove Dura-Bar SSDI can be oil quench hardened from 1650° F (898° C) to a hardness Rockwell C 35–40. From these tests, it can be concluded that there is an overall uniformity and consistency. When untreated, SSDI’s microstructure is primarily ferritic, however when heat treated, the microstructure changes and becomes martensitic.

Microstructure

The microstructure consists of Types I & II nodular graphite as defined in ASTM A247. The matrix is ferrite with approximately 5–25% pearlite. The edge or rim will have a higher nodular count and will be mostly ferrite. Chill carbides will be less than 5% in any field at 100x and will be well dispersed.

Microstructure area diagram

Center Area

100x, etched in 5% Nital

65-45-12 ductile iron microstructure at center

Edge Area

100x, etched in 5% Nital

65-45-12 ductile iron microstructure at edge

Stock Sizes: SSDI

Rounds

Dura-Bar rounds

0.000" to 00.000"

As-cast round bars are made to clean up at the nominal size. Additional stock is added to allow for out-of-round and normal imperfections in the as-cast surface. Stock allowance is a function of the bar diameter - see Stock Allowances for details. Other finishes available are Centerless Grinding and Centerless Turning, for demanding tolerance applications.

Rectangles

Dura-Bar rectangle products

0.000" to 00.000"

As-cast rectangles are made to the actual size with no allowance for machine stock added. Rectangles are cast to actual dimension, with clean up stock dependent on the height and width ratio. See Stock Allowances for details. Rectangles can be milled to achieve close tolerance benefits - see Services/Milling for details.

Squares

Dura-Bar rectangle products

0.000" to 00.000"

As-cast squares are made to the actual size with no allowance for machine stock added. Squares are cast to actual dimension, with clean up stock dependent on the height and width ratio. See Stock Allowances for details. Squares can be milled to achieve close tolerance benefits - see Services/Milling for details.


Technical Specifications

Chemical Composition

*Carbon and silicon targets are specified for each bar size in order to maintain mechanical properties. Magnesium is added as an inoculant to produce nodular graphite.

ElementPercentage
Carbon*3.20–3.75%
Silicon*3.25–4.00%
Manganese0.15–0.35%
Sulfur0.025% Max
Phosphorus0.05% Max

Mechanical Properties

Hardness properties for various diameters are shown in the table. Hardness properties listed are minimum and maximum across the bar. For rectangles, squares and shapes, the hardness properties will depend on minimum and maximum section thickness and will be supplied on request.

Size RangeBHN
InchesmmMinMax
1.000–20.00025–508167229

Tensile strength is determined from a longitudinal test specimen take from mid-radius of the as-cast bar.

Mechanical Properties
Tensile strength psi (min)75,000
Yield strength psi (min)55,000
Elongation (min)15%